[boskid][1.1.69] Underground belt item duplication

[thuejk]

Ghost a yellow underground connection. Have a pair of blue (or red) undergrounds in inventory, whereof one is damaged. Place one of the blue undergrounds on top of the yellow underground ghost. Now you have 3 blue undergrounds.

[thuejk]

Oh, it works without the ghosts too. Using the same upgrade-both-sides-instantly behavior.

[thedoh]

This appears to work with downgrading, too.

Place a pair of red underground (could even be your damaged one) and use a damaged yellow to do the downgrade. One can rapidly generate "free" underground belts toggling back and forth in this fashion.

[boskid]

Thanks for the report. Issue is now fixed for 1.1.70.